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It can be picked up by using the "use" key and can also be taken through portals.

The Weighted Storage Cube can also be used as a makeshift weapon against an Aperture Science Sentry Turret by dropping it on the Sentry Gun from a Portal, or as a makeshift shield to block turret fire and energy pellets.

In Portal 2, the cubes have a circular blue light on each side, and when left on a button it changes to a yellow light. They are also notably smaller in size than in Portal.

The Weighted Companion Cube in Portal 2 bears a resemblance to the standard Cubes, their only difference is that they have a heart on each face of the Cube and emit a pink light.

A special type of Storage Cube, the Weighted Companion Cube appears in both Portal and Portal 2. It is identical to the regular Weighted Storage Cube in both games, except that it has a heart where the Aperture Science logo would be. At the end of the Test Chamber 17 in Portal, the player is forced to throw it into an Aperture Science Emergency Intelligence Incinerator. Narrative provided by GLaDOS and Doug Rattmann suggests that the Companion Cube is designed to test emotional stress by having subjects develop affection for it before being forced to destroy it.

In Portal 2's second chapter Test Chamber 07, GLaDOS reveals that there are warehouses full of Weighted Companion Cubes shortly after disintegrating two of them. She also contradicts her statements from the first game, openly stating that they are sentient. As the Material Emancipation Grill for that chamber is not functioning, Chell can remove the companion cube from that chamber (earning the player the "Preservation of Mass" achievement/trophy), only to have GLaDOS destroy it herself shortly before reaching the elevator.

It is unknown whether the Companion Cube can communicate openly in any way. Although generally the Cube actually talking seems to be a sign of madness, if the "Preservation of Mass" achievement is earned, GLaDOS claims the Cube was about to say "I love you," and in Portal 2, the Cube produces a chime, which foreshadows the Turret Opera.

Twentieth century prototypes of the Storage Cubes were seen in the old condemned parts of the Aperture Science Innovators test chambers, where they also served a similar purpose for weighing down buttons. These cubes can react to the Mobility Gels, as well. It is unknown if the early cubes were simple crates with nothing inside, or if they were actually weighed down to help push down and hold in place the early Aperture Science Super Buttons. These cubes also appear to be made of wood, held together by staples. No analogue of the Companion Cubes appear.

The Weighted Companion Cube was invented because playtesters often failed to realize that the puzzle required you to take the cube with you, so they made it unique and more noticeable, and had GLaDOS put a great deal of emphasis on it in her voiceover.

A Weighted Companion Cube plush and fuzzies are available to purchase online at Valve online.[5][6]

A Companion Cube prop can be unlocked for Xbox Live avatars by completing the Portal 2 Single Player campaign.

The Companion Cube from Portal is implied to have never been completely incinerated during the ending sequence of Portal 2. This is noted by the amount of burns marks it has sustained, also implied from statistics of the Portal Gun which can endure temperatures of up to 4000 kelvin, that subsequent Aperture products are also able to. In addition, the Companion Cube in Portal 2 sports a new design, but the cube in the ending sequence is the Portal design.

In Portal 2, when held, the Companion Cube causes the game to play a type of tune or chime specific to it, much like how certain music plays during the activation or use of certain testing elements of functioning Aperture Science technology (eg. Aerial Faith Plate). The tune is a loop that foreshadows the upcoming Turret Opera at the end of the campaign.

In the Xbox 360 game Fable III, a crate with a heart painted on each of its sides can be found in one of the game's dungeons, being worshipped by a creature called a Hobbe. On the table next to the cell in which the Hobbe is being kept, there is also a Cake.

In Call of Duty: Modern Warfare 2 there is an unlockable title called "Companion Crate" on hearts background, most likely referring to Portal and Portal 2